Hi, while meandering around on ebay I noticed lots of 2 channel integrated amps being sold in a small package, and designed to run from a 12v supply. they cost around $20 (prices varies depending on wether or not you have free postage) and seem to come from Hong Kong.

This is an example, and I wondered if anyone knows what they use internally ?

It says 180 W + 180 W , into 4 ohms I guess as the load impedance range is quoted as 4 to 16 ohms.
Power supply requirement is 12 V at 6 Amps. Thats 72 watts power consumption and 360 watts power output ! That means the output power is about 5 times the input power !

I recently saw a car amplifier with 10 kW output power on eBay. That's 13,6 HP at 100 % efficiency.
Add the air conditioning you need to get rid of all that dissipated heat, and a small car might be left with no power at all to move.
Of course the motor would also have to fight against additional weight from the cables you need for 10000 W / 12 V = 833,3 A plus losses.

Now, how much Chinese Watts does it take to make a normal Watt?
Maybe the demands on the car are not as bad as they seem?

Originally posted by Redshift187 Google PMPO. It's a useless rating a lot of cheap equipment is using now.

And fooling the average Joe. It's at the point where a true 500 watt sub amp sounds ridiculously under powered.
HT in a box with 1500 watts! Amplified computer speakers = 400 watts.
Oh, car audio. Lets not forget about those ratings.